Web shell allows access to the ubi command line program without
installing it. All features of ubi are available in the web shell,
except for the program execution features.
To avoid the need to create a personal access token to use the
web shell, the internal cli request sets clover.web_cli_session_id
in the request environment, and the internal request uses that
as the session id if that exists. So web cli requests are only
checked against the account's permissions, they are not checked
against a token's permissions. I think this approach is better
than forcing a user to create a personal access token to use the
web shell.
For ease of use, this uses the autofocus attribute, so add that as
a boolean attribute.
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